RESEARCH OF THE COMPONENT COMPOSITION OF DRYING RENOVATION BRICK CRUMB PLASTER FOR RESTORATION OF ARCHITECTURAL MONUMENTS

The article presents the results of analytical studies to establish the authentic component composition of the brick crumb plaster, which was used to furnish architectural monuments of the 10th - 12th centuries. In laboratory conditions, a number of experimental studies aimed at the production of brick crumb plaster according to the historical recipe were performed. However, a number of requirements were set for such plaster, according to which it must meet European and domestic requirements for drying renovation plasters. The peculiarity of such plasters is low compressive strength (1.5 - 5.0MPa), high porosity (>45 %) and a low coefficient of resistance to water vapour diffusion (<12), which allows drying overmoistened walls and at the same time extracting salts from them and accumulating them in the pores of their volume. In the process of experimental research, the historical recipe of the plaster was slightly modified, which made it possible to obtain a plaster with the specified parameters. The performance of plastering works with a scientifically based recipe of brick crumb renovation plaster on an architectural monument in the city of Chernihiv gave a positive result with a decrease in salinity and humidity of the walls.